Solve: a – b = 3, a2 +b2 = 29 then ab=? A) 5 B) 10 C) 15 D) 20 Solution a2+b2 = 29 ………..(1) a-b = 3 (a-b) 2 = 9 ……..(2) a2–2ab+b2=9, or a2+b2 -2ab = 9 29–2ab = 9 2ab = 29–9 = 20 so ab = 20/2 = 10 Related MCQs: Solve : 5 + 6 x 3 – 2 ÷ 2 = ? A mug filled with half of the liquid weighs 700 gm. When it is empty, it weighs 200 gm. How much will it weigh when 3/4 of it is full of liquid? A famous book “A Case of Exploding Mangoes” was written by? 3x+16=40 what is the root of x?
